2008-06-27_REPORT - C1980007 (7)

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Well SOM 23-H-3 Water Duality and Field Parameters 0 • Mountain Coal West Elk Mine Monitoring Location: SOM-23-1-1-3 Baseline' 2007 Water Year Description Units Minimum Maximum a Mean" 4/27/2007 5/25/2007 8/23/2007 Q 5 Field Parameters Water Level Depth feet 180.59 186.50 183.86 192.9 192.6 196.5 Electrical Conductivity µmhos/cm 1690 3210 2490 2150 2090 2170 H S U 8.40 8.76 8.59 8.64 8.39 8.28 Temperature of 46.5 51.8 49.0 50.4 51.6 52.3 Temperature °C 10.2 10.9 11.3 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L64613-05 Sample Date 8/23/2007 Lab Test Date 8/24-9/13 Sampled B Alkalinity (Total CaCO3) mg/l 937 1240 1144 1160 Aluminum, dissolved m /I Ammonia m /I 0.03 0.09 0.05 0.02 B Anions me /1 19.3 23.9 22.8 23.2 Arsenic, dissolved m g/1 -0.001 -0.001 -0.001 -0.0005 U Arsenic, total m /l Bicarbonate m /I 896 1100 1034 1030 Boron, dissolved m /I 0.64 1.45 0.80 0.73 Cadmium, dissolved m g/1 -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 2.8 12.6 4.7 3.9 Carbonate m /I 40 140 111 124 Cation - Anion Balance % -2.4 2.0 0.9 0.0 Cations me /1 20.1 23.7 22.6 23.2 Chloride m g/1 4 6 5 6 Conductivity µmhos/cm 1560 2170 1945 2000 Copper, dissolved m /I Hardness m /I 13 57 22 17 Hydroxide m q/1 2 -2 -2 -2 U Iron, dissolved m g/1 0.12 10.70 2.63 0.67 Iron, total m /I 2.77 866'f3i " >E >k3769"* 2.33 Lead, dissolved m /l -0.0001 0.0046 -72.1652 0.0027 Magnesium, dissolved m /I 1.3 6.1 2.2 1.7 Manganese, dissolved m a/1 0.019 0.310 0.077 0.052 Manganese, total m /l 0.040 1.79 0.349 0.076 Mercury, dissolved m /l -0.0002 0.0127 0.0019 -0.0002 U Mercury, total m /I Molybdenum, dissolved m g/1 Nitrate as N dissoloved m /l -0.02 0.07 0.02 -0.02 U Nitrate/Nitrite as N m /I -0.02 0.07 0.03 -0.02 U Nitrite as N dissoloved m /l -0.01 -0.01 -0.01 -0.01 U Nitrogen, ammonia m g/1 0.59 1.27 0.74 0.48 B H SU 8.4 8.9 8.7 8.7 H Phosphate m /I -0.03 0.24 0.08 0.40 Phosphorus Ortho , dissolved m q/1 -0.01 0.08 0.03 0.13 Potassium, dissolved m g/1 2.5 3.3 2.9 2.6 Selenium, dissolved m /I -0.001 0.002 0.001 -0.0001 U Selenium, total m /l Sodium Absorption Ratio SAR ca1c. 25.1 61.4 53.0 55.50 Sodium, dissolved m /l 428 526 501 516 Sulfate m /I -10 20 7 -10 U TDS Ratio calc. 0.92 1.00 0.96 0.94 TDS Calc. m g/1 1060 1310 1240 1270 TDS m g/1 970 1270 1197 1200 TSS m /l Zinc, dissolved mg/I -0.01 0.04 0.01 0.08 1 Baseline 2005 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels a Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless all readings are below detection limit 5 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine G-17 2007 Annual Hydrology Report HydroGeo, Inc.